In process of high precision and high stability dot measurement, either it is pointing at close or long distance, it makes good job to operate a Berlinlasers 515nm green laser diode module. Different from a formally used 532nm green DPSS laser system, after its direct and intense green laser light emission from a 515nm green laser diode, and metal heat sink cooling system, it just gets increasing laser beam stability and highly clear forest green dot projection in continuous use. 
This 515nm green dot laser alignment applies qualified glass coated lens and glass window. It is working for long distance and long lasting use. When it projects high transmittance green laser light, it also makes sure of clear and no decay light dot emission within long extending distance of 25 meters. It provides users high level of accuracy dot alignment for industrial precise dot alignment, drilling system, laser marking, laser engraving, laser medical therapy and high tech work etc.
https://www.berlinlasers.com/515nm-green-laser-diode-module